Part A
AD7226KRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6418 個数
- Package
- SOIC-20
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD7226KRZ and AD7225KR are not drop-in replacements for one another. Although both are quad 8-bit voltage-output DACs from Analog Devices in comparable packages, they differ in output amplifier architecture, reference input arrangement, and interface timing, so a direct board-level swap is not supported without design validation.
Different output amplifier configuration
Different reference input architecture
Different interface timing
Validation required before substitution
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7226KRZ | AD7225KR | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 4 | 4 | Channel count determines how many independent analog outputs the system can drive; both are quad DACs so this is functionally equivalent. |
| DAC Architecture / Resolution | 8-bit voltage output DAC | 8-bit voltage output DAC | Resolution and architecture define the output granularity and linearity; matching 8-bit voltage-output topology supports direct substitution. |
| Output Voltage Range | 0 V to VREF (unipolar, VSS = 0 V) | 0 V to VREF (unipolar) or ±VREF (bipolar capable) | The AD7225 supports bipolar operation via an external reference, while the AD7226 is unipolar only; this affects whether negative output swings are achievable. |
| Reference Input | External reference required | External reference required | Both require an external voltage reference, so the reference design can be reused without change. |
| Digital Interface | Parallel, double-buffered inputs | Parallel, double-buffered inputs | Interface type and buffering determine how the DAC connects to the host bus; identical parallel double-buffered inputs allow drop-in logic compatibility. |
| Supply Voltage | +15 V (VDD), +5 V logic, VSS for negative swing | +15 V (VDD), +5 V logic, VSS for negative swing | Supply requirements must match the board's power rails; identical rails mean no power-supply redesign is needed. |
| Package | 28-lead SOIC (R-28) | 24-lead PDIP (N-24) | Package and pin count affect PCB footprint and assembly; different packages require layout changes and are not drop-in compatible. |
| Operating Temperature Range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Temperature grade determines suitability for the target environment; matching commercial ranges support equivalent application use. |
| Settling Time | ~5 µs (to ±1/2 LSB) | ~5 µs (to ±1/2 LSB) | Settling time limits update rate in multiplexed or control-loop applications; comparable values indicate similar dynamic performance. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7226KRZ | AD7225KR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 4 | 4 |
| Settling Time | 4µs | 4µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | Parallel |
| Reference Type | External | External |
| Voltage - Supply, Analog | 11.4V ~ 16.5V, -5V | 11.4V ~ 16.5V, -5V |
| Voltage - Supply, Digital | 14.25V ~ 15.75V | 14.25V ~ 15.75V |
| INL / DNL(LSB) | ±0.5 (Max), +1 (Max) | ±1 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD7226KRZ and the AD7225KR?
The AD7226KRZ is a quad 8-bit voltage-output digital-to-analog converter (DAC) with four on-chip output amplifiers, while the AD7225KR is a quad 8-bit voltage-output DAC that includes a programmable output amplifier configuration allowing both voltage and current output modes. Both are 4-channel 8-bit DACs, but the AD7225KR offers greater output flexibility through its configurable amplifier architecture.
Are the AD7226KRZ and AD7225KR pin-compatible?
No. The AD7226KRZ and AD7225KR are not pin-compatible. They are housed in different package types and have different pin configurations. The AD7226KRZ is supplied in a 20-lead SOIC (R-20) package, while the AD7225KR is supplied in a 24-lead SOIC (R-24) package. A direct drop-in replacement is therefore not possible without PCB redesign.
What is the resolution and channel count of each device?
Both the AD7226KRZ and the AD7225KR are 8-bit resolution DACs with four independent DAC channels. Each channel includes its own input register and DAC latch, allowing independent updating of each output.
What supply voltage and reference requirements do these DACs have?
Both the AD7226KRZ and AD7225KR operate from a single +12 V to +15 V power supply and require an external reference voltage. The reference input range and output voltage span are set by the applied reference, and both devices are specified for operation over the 0°C to +70°C commercial temperature range (K grade).
How do the digital interfaces of the AD7226KRZ and AD7225KR differ?
Both devices feature a microprocessor-compatible parallel digital interface with data latches for each DAC channel. The AD7226KRZ uses a 2-bit address input (A0, A1) to select which of the four DAC latches is written, along with WR and CS control lines. The AD7225KR similarly uses address and control lines but its pinout and control signal arrangement differ due to the 24-lead package and its additional output amplifier configuration pins.
Can the AD7226KRZ and AD7225KR be used interchangeably in an existing design?
No. Because the two devices differ in package size (20-lead vs 24-lead SOIC), pinout, and output amplifier architecture, they cannot be used interchangeably without modifying the PCB layout and verifying that the output configuration of the AD7225KR matches the system requirements. Designers should consult the respective manufacturer datasheets before considering any substitution.
What are the output amplifier characteristics of each device?
The AD7226KRZ integrates four fixed voltage-output amplifiers that buffer each DAC output, providing a voltage output swing determined by the reference. The AD7225KR features four output amplifiers whose configuration is programmable, enabling either voltage output or current output operation depending on how the amplifier feedback is connected. This makes the AD7225KR more versatile for applications requiring current-loop or unipolar/bipolar voltage outputs.